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Symptom
No Heat/
No Cool/
No Fan
(common problem)
No Heat
No Cool
Heat, Cool or Fan
Runs Constantly
Thermostat Display
& Thermometer
Disagree
(Troubleshooting continued on next page)
6
TROUBLESHOOTING
Possible Cause
1.) Blown fuse or tripped circuit
breaker
2.) Furnace power switch to OFF
3.) Furnace blower compartment
door panel loose or not
properly installed
4.) Loose connection to
thermostat or system
1.) System Switch not set to
Heat
2.) Loose connection to
thermostat or system
3.) Heating System requires
service or thermostat
requires replacement
1.) System Switch not set to
Cool
2.) Loose connection to
thermostat or system
3.) Cooling System requires
service or thermostat
requires replacement
Possible short in wiring,
thermostat, heat, cool or fan
system
Thermostat display requires
adjustment
Corrective Action
1.) Replace fuse or reset breaker
2.) Turn switch to ON
3.) Replace door panel in proper position to engage
safety interlock or door switch
4.) Tighten Connections
Verify thermostat and system wires are securely
attached.
Diagnostic: Set System Switch to Heat and raise
the setpoint above room temperature. Within five
minutes the thermostat should make a soft click
sound and "Heat On" should appear on display.
This sound indicates the thermostat is operating
properly. If the thermostat does not click, try the
reset operation listed below. If the thermostat does
not click after being reset, contact your heating and
cooling service person or place of purchase for a
replacement. If the thermostat clicks, contact the
furnace manufacturer or a service person to verify
the heating system is operating correctly.
Verify thermostat and system wires are securely
attached.
Diagnostic: Set System Switch to Cool and lower
setpoint below room temperature. Same procedures
as diagnostic for "No Heat" condition except set the
thermostat to Cool and lower the setpoint below the
room temperature. There may be up to a five minute
delay before the thermostat clicks in Cooling if the
compressor lock-out option is selected in the installer
menu. (see INSTALLER MENU, item 50)
Check each wire connection to verify they are not
shorted or touching other wires. Try resetting the
thermostat. If the condition persists contact your
HVAC service person.
Display can be adjusted +/-5°. See User Menu item
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